In my usecase (a NTFS USB drive attached to Raspberry Pi 4, 90k files) I'm seeing continuous high CPU usage in top (over 90% all the time) of:
/bin/mpd --no-deamon
File indexing / database updates have finished. Is this still expected behavior? Any ideas on how I can see what MPD is so busy with? Should we expect improved behavior if I reformat to ext4?